Removed additional warnings
Removed additional warnings

donholly/AFNetworking,NextThought/AFNetworking,OmarPedraza/AFNetworking,michal-olszewski/AFNetworking-CustomCallbacks,michal-olszewski/AFNetworking-CustomCallbacks,dake/AFNetworking,dilumn/AFNetworking,jeremiahyan/AFNetworking,BohemianCoding/AFNetworking,wangxiaoxiang/AFNetworking,kevin-zqw/AFNetworking